Bit attachment for bailers



April 26,1932. ca. w. MILLER I 1,855,434

BIT ATTACHMENT FOR BAILERS Filed July 8, 1929 a 7 L a 3 k l, a 1/7 a; 1% m lNVENTOR BY Geo/9e W MY/ez WOW '- ATTORNEY Patent ed Apr. 26, 1932 UNITED STATES PATENT OFFICE BIT ATTACHMENT FOR BAILERS Application filed July 8, 1929. Serial No. 376,780.

My invention relates to drill bits and more particularly to a device of that character for use in connection with a bailer for well cleaning purposes; the principal object of themvention being to operate the bit with a healer supported from the usual sand l1ne, thereby eliminating the separate cable line ordlnarily employed in operating a well cleaning bit.

In accomplishing this and other ob ects of u. the invention, I have provided improved details of structure, the preferred forms of which are illustrated in the accompanying drawings, wherein:

Fig. 1 is a vertical section of the lower portion of an oil well, illustrating operation of the bit in connection with a bailer.

Fig. 2 is an enlarged detail perspective view of the .bit.

- Fig. .3 is a central vertical section through \V .m the bit on the line 33, Fig. 1, showing 1ts connection with a bailer. Fig. 4 is a transverse section on the llne Jr-4, Fig. 3.

Referring in detail to. the drawings:

. :3 1 designates an oil well extending throug cap rock 2 and terminating in a shot hole 3 in the oil sand 4, and 5 deslgnates sand, rock or dbris collected in the shot hole incident to shooting of the well, reaming or natural 3o dislodgement from the walls of the shot hole.

The well hole is lined with casing 6 supported on the cap rack, and adapted for receiving and guiding'a bailer 7 for lowering '4 13 extending downwardly from a head portion 14 and terminating on opposite sides of a flared cutting tip 15.

Provided on the head portion is a coupling shank 16 adapted to fit snugly within 43 the lower end of the bailer and to be substi- --tuted for the ordinary bailer bottom, and having spaced stop bosses 17 for engagement in bayonet slots 18 in the walls of the bailer, and which may be secured in the slots by the 59 usual bailer latch 19 and set screw 20.

Extending centrally through the shank 16 is an opening 21 connecting through an axial channel in the head with branch ports 22 communicating with the grooves 13 and adapted for conducting fluid through the head as of the bit into the bailer. The opening 21 is provided with a reduced lower end form- 'ing a tapering seat23 in the shank at the .upper end of the body for cooperating with a ball check valve 24 retained in the opening "B0 by retainer pins 25, and adapted for preventin return flow of fluid through the opening.

hen the bit is to be employed in connection with the bailer, the ordinary bailer bottom is removed to permit insertion of the coupling shank 16 into the bailer and engagement of the stop bosses 17 in the bayonet slots 18.

With the bit secured to the bailer, and the bailer attached to the sand line, the connected members are lowered to the bottom of the well for a cleaning operation.

The drill bit is reciprocated at the bottom of the well by the sand line for breaking up the rock or encrusted sand in the shot hole 7 into small particles, for delivery into the bailer with the fluid through the ports 22 and valved opening 21..

When the bailer is filled with the sediment laden fluid the members may be withdrawn from the well to permit emptying of the bailer, and the operation repeated until all dbris is removed from the shot hole. It will be obvious that the bit may be readily attached to or removed from a bailer to suit the conditions of difierent wells, and without altering the coupling means of the conventional type bailer, thereby efiecting a considerable saving of time in the cleanmg of wells.

What I claim and desire to secure by Letters Patent is:

1. In combination with'a bailer havin a bayonet slot, a bit having a head provi ed with anaxial channel and branch ports lead- '95 ing downwardly from said channel, a reduced shank on said head receivable in the bailer, and having an axial opening of. greater diameter than said axial openingin. the head to form a valve seat,.a lug on said shank receivable in the bayonet slot of the bailer, a valve movable vertically in sand shank to engage said seat, and means on the shank restricting upward movement of the valve.

2. A drill bit for attachment to a bailer, including a body portion having longitudinal grooves, ports opening to said grooves, andan axial channel communicating with 10 said ports, a shank on the upper end of the body reduced to engage in the lower end of the ailer and having an axial bore of greater diameter than said channel to form a valve seat at the upper end of the body channel, a 15 ball.valve movable in the shank bore, a stop member mounted in the shank to limit upward movement of the valve, and a lug projecting laterally outwardly from the shank for latching the bit to the bailer. so In testimony whereof I afiix my signature.

GEORGE W. MILLER. 

